The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 1980
Filed:
Dec. 26, 1978
Applicant:
Inventors:
Assignee:
Nippon Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04Q / ;
U.S. Cl.
CPC ...
179 / ; 179 / ; 179 / ;
Abstract
A key telephone system includes among other things a central switching network comprises of a main switch matrix including main talking paths and trunk paths, an auxiliary switch matrix including auxiliary talking paths and a coupling matrix between the main and auxiliary switch matrices and in which system each of the telephone station sets can talk through a plurality of talking paths, concurrently, and is capable of talking back hand-free.
Tanihata, Ryoichi. (1980). Electronic key telephone system (U.S. Patent No. 4236049). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4236049
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile